公开(公告)号：CA1226623A

公开(公告)日：1987-09-08

申请号：CA458355

申请日：1984-07-06

Applicant: IBM

Inventor： BLAND PATRICK M ,  BOLT WILLIAM H

IPC: H02J1/00 ,  G06F1/00 ,  G06F1/32 ,  G06F3/02 ,  G06F3/023

Abstract: POWER CONSERVATION SYSTEM IN BATTERY . POWERED KEYBOARD DEVICE INCLUDING MICROPROCESSOR In a self-contained battery powered keyboard entry device, the keyboard is driven from a microprocessor and its output sensed by the microprocessor to generate drive signals for an infra-red transmitter. The sense lines are monitored so that, on a key depression, the microprocessor is switched to an operating mode from its low-power standby mode. When all sensed signals have been processed and outputted, the microprocessor is returned to the low-power standby mode.